I am experiencing some issues with my Joomla admin page. It has been working fine and we haven't installed or changed anything recently but for some reason, I can't access the admin page. The front end is working but the back end isn't. Every time I go to the log in page, I put my details in and it returns with a HTTP 500 error page. The challenge is that I am no Joomla expert, I know how to work Joomla, although I am not a web developer and I didn't build this site, I just create and manage the content. The developer that built it for us, no longer works at the company. We have another site built in expression engine so we had our other developer look at it but he isn't familiar with Joomla and wasn't able to fix the problem but suspects it's a plugin that's not compatible but is unable to find it and we haven't changed anything recently. I tried looking on the Joomla forum but it's basically a different language to me as mentioned before, I'm not a joomla expert. I contacted the guys that host our server but they checked and it's nothing on their end, it's just simply isolated to the back end of the joomla site.
No idea what to do or how to fix the problem - does anyone know what's going on?

There are many variables that can cause a 500 error, the most common being a file permission incorrectly set. Then there's the possibility of an erroneous .htacces file. A bad php code causing too many connections therefore the sever process times out.

jackrabbit wrote:There are many variables that can cause a 500 error, the most common being a file permission incorrectly set. Then there's the possibility of an erroneous .htacces file. A bad php code causing too many connections therefore the sever process times out.

The server error log will give an idea of the cause.

Thanks for your reply - the thing is, we were using the back end and it was fine but I haven't been able to log in this week. Since the last time I was in, I haven't installed or changed anything - this is why I don't understand what's wrong. The developer who set up the site no longer works for the company and we don't have anyone in-house that has the capabilities to sort this out. I read a few posts that mentioned that a certain permission may have been disabled but (I know this sounds silly but I don't have any experience in this area so forgive the ignorance, I just manage content on the site) how can I access any of this to check what the problem is, if I can get into the back end - is there a trick I am missing here?

Thanks for your reply!
Well nothing really has changed since the last time I logged in - on Friday I was editing some of the article pages but that was about it (only minor edits to text) and then went home for the weekend. I came back this week and I've not been able to get in so I am totally stumped? I didn't update anything either.
No, we don't have any security extensions added :-/

t_greig wrote:how can I access any of this to check what the problem is, if I can get into the back end - is there a trick I am missing here?

You may get an idea of the error by viewing the error_log in Joomla root and the administrator directory. Though you may lack tech abilities, there is logic in the out put that could point you in a proper direction. Otherwise you need someone with the abilities to assist.

t_greig wrote:...
... I contacted the hosts and they said they didn't change anything

Something must have changed ? Sometimes it's as simple as your IP address is disliked. Have emailed you so you can send me login details. Ask around I don't abuse logins.

Yeah, that's what I can't figure out. The hosts have previously blocked the IP but we managed to resolve that and it has worked fine since. The front end works fine too so it's not as clear cut. I am new to this forum so the private message feature doesn't work for me yet - it says I have to participate more before it's activated. Could you please private message me your email address and I can share the details.

We have a main website on the 'site.com' domain and that is built in Expression engine, we then created the subdomain which is our microsite which is 'site.com/xxxxxx' the site url I shared via email and that one is built in Joomla.

What would cause a broken padlock and is it possible to fix? Also, I am not too sure about the cert as the previous developer set all that up and he no longer works for us - what would I need to do to rectify this? The site has been working fine for over a year now so is this misconfiguration something that has recently happened and would our server hosts need to sort that out?

All I know about ssl certs is with my Host I just define the domain name and the cert works correctly from domain down through the subdirectories. But as far as I can see with your site the cert only shows the broken padlook on http:// site.com/subdirectory. AFAIK the padlock should only show with https: not http:

Not sure if it's a certificate misconfiguration or not. You need to speak to your Host about your certificates they should be able to advise you if the cert is configured correctly.

Webdongle wrote:All I know about ssl certs is with my Host I just define the domain name and the cert works correctly from domain down through the subdirectories. But as far as I can see with your site the cert only shows the broken padlook on http:// site.com/subdirectory. AFAIK the padlock should only show with https: not http:

Not sure if it's a certificate misconfiguration or not. You need to speak to your Host about your certificates they should be able to advise you if the cert is configured correctly.

Thanks for your message! I contacted the host and they said: We can only order SSL and install it for the main domain via WHM interface and that is it.
Also as I see the main site https://site.com and https://site.com/xxxxxx has correctly installed SSL

So I think that eliminates that problem? A few people said they think that it might be an update or extension that is no longer compatible:

It looks to me as though the Joomla system version was updated on the morning of October 4th, and my guess would be that one of the plugins or extensions that the site is using is incompatible with this new version of Joomla, and is causing the error message. I suspect that the way to resolve this would be to switch off the extensions one-by-one until the culprit is found, and to try to upgrade it to a more recent version

Could this be right as that is roughly when I couldn't access the back end?